Rab Ultrasphere 4.5 Sleeping Mat

lightweight warmth for fast-and-light adventures

The Rab Ultrasphere 4.5 sleeping mat offers a remarkable blend of ultralight weight and high thermal efficiency, making it perfect for fast packing, bikepacking, thru hiking, and mountain running. Its innovative design integrates two layers of heat reflective TILT film and offset air chambers to achieve a notable R‑value of 4.5. The tapered mummy shape and soft, 20D recycled polyester fabric with a fluorocarbon free DWR coating ensure both comfort and compactness. A low-profile two way valve, pump sack, stuff sack, and repair kit make setup and maintenance straightforward.

Features

• Dual layer TILT reflective film conserves radiant heat without added bulk
• Offset air chamber layout enhances heat retention in a light structure
• Tapered mummy form reduces unnecessary material for comfort and weight savings
• Low profile two way valve and included pump sack enable rapid, hygienic inflation and micro adjustment
• Packable into a compact roll away stuff sack; repair kit included for on trail fixes

Specifications

• Claimed Weight: 370 g (Regular); 505 g (Long Wide)
• Dimensions (Regular): 183 cm (L) x 51 cm (W) x 8 cm (Thick)
• Dimensions (Long Wide): 196 cm x 64 cm x 8 cm
• Packed Size (Regular): 15 cm x 9 cm
• Packed Size (Long Wide): 19 cm x 9 cm
• R‑Value: 4.5
• Material: 20D recycled polyester outer with internal TPU coating
• Lining Material: fluorocarbon free DWR